General CSS question

Im looking through my css file to take note which colour codes actually change what on my site.
I would like to know if & how i can write next to the code so its only shown in the css file and not on the site.

Example
I can write main mebu fine

Code:

---

/*MAIN MENU*/
.menu-toggle{
        display:block;
        padding:10px;
        margin:1px 0 0;
        background:#0099FF;

---

But some have a few colours in the code so i would like to write it next to the code.
Example.

Code:

---

        background:#0099FF; SO I CAN PUT IT HERE
        border: 2px solid #000000; SO I CAN PUT IT HERE
        color:#000000; SO I CAN PUT IT HERE

---

Currently if i use the main menu approach next to the code its shown on the site.

Thanks

They are called "Comments". Go to this page and scroll down to the bottom.

Thanks.
Just w was looking for.